NGC 7635, also known as the Bubble Nebula, Sharpless 162, or Caldwell 11, is an H II region emission nebula in the constellation Cassiopeia. It lies close to the direction of the open cluster Messier 52. The “bubble” is created by the stellar wind from a massive hot, 8.7 magnitude young central star, SAO 20575 (BD+60°2522). The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star, causing it to glow. It was discovered in 1787 by William Herschel. The star BD+60°2522 is thought to have a mass of about 44 M☉.

Telescope: Astro Physics 175EDF f8.3
Mount: Astro Physics 3600GTO “El Capitan”
Camera: SBIG STT8300
Guider: SBIG FW8G OAG(Guided Filter Wheel)

L: 14×10 mins = 140 mins, R: 12×10 mins = 120 mins, G: 12×10 mins = 120 mins, B: 12×10 mins = 120 mins

Total Imaging Time: 8h 20m

Data Imaged remotely over 2 nights during October 2015.
Data acquisition & Processing by David Churchill.

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